projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| cdff2642 JJ |
1 | /* |
| 2 | * AppArmor security module | |
| 3 | * | |
| 4 | * This file contains AppArmor basic path manipulation function definitions. | |
| 5 | * | |
| 6 | * Copyright (C) 1998-2008 Novell/SUSE | |
| 7 | * Copyright 2009-2010 Canonical Ltd. | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or | |
| 10 | * modify it under the terms of the GNU General Public License as | |
| 11 | * published by the Free Software Foundation, version 2 of the | |
| 12 | * License. | |
| 13 | */ | |
| 14 | ||
| 15 | #ifndef __AA_PATH_H | |
| 16 | #define __AA_PATH_H | |
| 17 | ||
| 18 | ||
| 19 | enum path_flags { | |
| 20 | PATH_IS_DIR = 0x1, /* path is a directory */ | |
| 21 | PATH_CONNECT_PATH = 0x4, /* connect disconnected paths to / */ | |
| 22 | PATH_CHROOT_REL = 0x8, /* do path lookup relative to chroot */ | |
| 23 | PATH_CHROOT_NSCONNECT = 0x10, /* connect paths that are at ns root */ | |
| 24 | ||
| 25 | PATH_DELEGATE_DELETED = 0x08000, /* delegate deleted files */ | |
| 26 | PATH_MEDIATE_DELETED = 0x10000, /* mediate deleted paths */ | |
| 27 | }; | |
| 28 | ||
| 2c7661ff | 29 | int aa_path_name(const struct path *path, int flags, char **buffer, |
| 57fa1e18 | 30 | const char **name, const char **info); |
| cdff2642 | 31 | |
| d4669f0b JJ |
32 | #define MAX_PATH_BUFFERS 2 |
| 33 | ||
| 34 | /* Per cpu buffers used during mediation */ | |
| 35 | /* preallocated buffers to use during path lookups */ | |
| 36 | struct aa_buffers { | |
| 37 | char *buf[MAX_PATH_BUFFERS]; | |
| 38 | }; | |
| 39 | ||
| 40 | #include <linux/percpu.h> | |
| 41 | #include <linux/preempt.h> | |
| 42 | ||
| 43 | DECLARE_PER_CPU(struct aa_buffers, aa_buffers); | |
| 44 | ||
| 45 | #define COUNT_ARGS(X...) COUNT_ARGS_HELPER(, ##X, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) | |
| 46 | #define COUNT_ARGS_HELPER(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, n, X...) n | |
| 47 | #define CONCAT(X, Y) X ## Y | |
| 48 | #define CONCAT_AFTER(X, Y) CONCAT(X, Y) | |
| 49 | ||
| 50 | #define ASSIGN(FN, X, N) ((X) = FN(N)) | |
| 51 | #define EVAL1(FN, X) ASSIGN(FN, X, 0) /*X = FN(0)*/ | |
| 52 | #define EVAL2(FN, X, Y...) do { ASSIGN(FN, X, 1); EVAL1(FN, Y); } while (0) | |
| 53 | #define EVAL(FN, X...) CONCAT_AFTER(EVAL, COUNT_ARGS(X))(FN, X) | |
| 54 | ||
| 55 | #define for_each_cpu_buffer(I) for ((I) = 0; (I) < MAX_PATH_BUFFERS; (I)++) | |
| 56 | ||
| 57 | #ifdef CONFIG_DEBUG_PREEMPT | |
| 58 | #define AA_BUG_PREEMPT_ENABLED(X) AA_BUG(preempt_count() <= 0, X) | |
| 59 | #else | |
| 60 | #define AA_BUG_PREEMPT_ENABLED(X) /* nop */ | |
| 61 | #endif | |
| 62 | ||
| 63 | #define __get_buffer(N) ({ \ | |
| 64 | struct aa_buffers *__cpu_var; \ | |
| 65 | AA_BUG_PREEMPT_ENABLED("__get_buffer without preempt disabled"); \ | |
| 66 | __cpu_var = this_cpu_ptr(&aa_buffers); \ | |
| 67 | __cpu_var->buf[(N)]; }) | |
| 68 | ||
| 69 | #define __get_buffers(X...) EVAL(__get_buffer, X) | |
| 70 | ||
| 71 | #define __put_buffers(X, Y...) ((void)&(X)) | |
| 72 | ||
| 73 | #define get_buffers(X...) \ | |
| 74 | do { \ | |
| 75 | preempt_disable(); \ | |
| 76 | __get_buffers(X); \ | |
| 77 | } while (0) | |
| 78 | ||
| 79 | #define put_buffers(X, Y...) \ | |
| 80 | do { \ | |
| 81 | __put_buffers(X, Y); \ | |
| 82 | preempt_enable(); \ | |
| 83 | } while (0) | |
| 84 | ||
| cdff2642 | 85 | #endif /* __AA_PATH_H */ |